Perastic or Peirastic: How To spell?

The word Perastic is misspelled against Peirastic, an adjective meaning "Fitted for trail or test; experimental; tentative; treating of attempts."

Word contains consecutive vowels 'EI' in between alphabets p & rastic is misspelled as 'E' as letter 'I' is phonetically ignore
Wrong Spelling:  p-e-rastic 
Correct Spelling:  p-ei-rastic 
Find more wrongly spelled words of Peirastic to spell it well.